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The Spectroscope and Gemmology Format:Paperback The Index enables you to good habits The Index enables you to look up concepts One Potato charts the crooked line between nature and technology and takes a deep look into a future shaped by disasters both natural and devastatingly man made The publication of Anderson's papers in the mid 1950s alerted gem laboratories worldwide to the importance of this instrument Until 1933 the refractometer and the microscope were the two principal tools in gem testing
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